TM 5-3805-254-20-1AIRBRAKE SYSTEMTREADLE VALVEFoot-operated air control valve to distribute air pressure throughout the airbrake system. Connected to air supply by mainsupply line. Provides distribution point for service or parking airbrake systems.AIR DRYERCannister containing moisture absorbing pellets. Removes moisture from air before storing in air reservoirs.ALCOHOL EVAPORATORAir compressor draws fine alcohol mist from alcohol evaporator and pumps it into air system, to help prevent moisturefrom forming in air system during operation.AIR RESERVOIRS (Two)Provides storage for compressed air to supply airbrakes and air-operated components.1-50